Ocean bottom seismometer (OBS) data off South Island, New Zealand, acquired during R/V Maurice Ewing survey EW9601 (1996)

This cruise was part of a joint US-New Zealand multiphase crustal-scale study of the Southern Alpine orogen across the central South Island of New Zealand, extending out to sea on either side of the island. This joint US-NZ investigation of continental deformation at convergent plate boundaries was known as the South Island GeopHysical Transection (SIGHT) project. MCS and OBS/OBH data were collected on the west (Tasman Sea) side and east (Pacific Ocean) side of South Island. At the end of the cruise OBS/OBH and SCS data were collected off Kakanui Point just south of Timaru as part of the Southern Cross Anisotropy Survey. One of the objectives was to improve understanding of continental deformation at convergent plate boundaries by using marine onshore/offshore seismic techniques to provide a detailed image of the plate boundary from both sides. Funded by NSF grant # EAR-9418530 and the Public Good Service Fund, Ministry of Research, Science

本次航次是美新联合多阶段地壳尺度研究的组成部分，该研究聚焦新西兰南岛中部的南阿尔卑斯造山带，研究范围延伸至该岛屿两侧的邻近海域。这项针对汇聚板块边界大陆变形的美新联合调查项目，被命名为“南岛地球物理剖面（South Island Geophysical Transection, SIGHT）”计划。研究团队分别在南岛西侧的塔斯曼海海域与东侧的太平洋海域采集了多道地震勘探（Multi-Channel Seismic, MCS）以及海底地震仪/海底地震台站（Ocean Bottom Seismometer/Ocean Bottom Hydrophone, OBS/OBH）数据。航次末期，作为“南十字各向异性勘测”的一部分，研究人员还在蒂马鲁以南的卡卡努伊角周边海域采集了OBS/OBH与单道地震（Single Channel Seismic, SCS）数据。本研究的核心目标之一，是通过海陆地震勘探技术获取板块边界两侧的高精度成像资料，以深化对汇聚板块边界大陆变形机制的认知。本项目由美国国家科学基金会（National Science Foundation, NSF）编号EAR-9418530的资助项目以及新西兰研究、科学部公共事业服务基金资助。